Product Description:

The RD52.1-7N-110-D-NN-FW is a drive controller manufactured by Bosch Rexroth Indramat within the RD 500 Drive Controllers series. Positioned between a shared DC bus and the motor terminals, it converts constant link voltage into variable three-phase output so automated machinery can start, accelerate, and stop under closed-loop regulation. It serves as a central power modulator in industrial automation cells that require precise speed and torque control. This operating role makes it suitable for process equipment where stable motor behavior is needed during changing load conditions and frequent speed adjustments.

Rated output of 110 kW lets this controller operate high-power pumps, fans, and extruders while remaining within its thermal capacity. It accepts a DC link range of 530 to 670 V, and within that span the converter maintains motor flux through pulse-width modulation. The controller uses an Inverter DC supply arrangement, so rectification and braking hardware are located on the common line side rather than inside the controller section. Closed-loop regulation is handled by field-oriented vector control, which separates stator currents into orthogonal components for fast torque response and stable low-speed operation. Heat from the power stage is removed through a plug-through cooler (≤ 110 kW) that extends the heat sink beyond the cabinet wall and reduces internal airflow demand. This cooling layout helps keep more waste heat outside the enclosure.

The unit is generation 1, so accessory and option boards need to match that revision. It is supplied without a built-in brake chopper, so regenerative energy from overhauling loads must be handled by an external chopper or a shared DC bus. Expansion slots are present, and the standard unit is supplied without technology or application modules. This leaves the base controller open for application-specific additions when the machine design calls for extra functions.